Hydraulic press.



No. 769,181. PATENTED SEPT. 6, 1904. 0. PHILIPP.

HYDRAULIC PRESS.

APPLICATION FILED APR 19 1904 HO MODEL.

@WMM/sw UNITED STATES Patented September 6, 1904.

PATENT OFFICE.

OTTO PHILIPP, OF DRESDEN, GERMANY,l ASSIGNOR-TO ELEKTRO- GRAVURE, GESELLSCHAFT MIT BESCHRNKTER HAFTUNG, OF LEIPZIG-SELLERHAUSEN, GERMANY.

HYVDRAULIC PRESS.

SPECIFICATION forming part of Letters Patent No. 769,181, dated September 6, 1904.

Application filed April 19, 1904.

The numeral 1 represents the lower {iX-ed.

platen of a hydraulic press, and 2'is an upper. frame mounted upon posts 8 vand provided with a depending perforated piston 4. This piston is'shown integral with the frame; but

lit may be formed from a separate piece bolted thereto. The hydraulic-press cylinder 5 is formed integral with the upper movable pressplaten 17 and embraces the piston 4L. The

cylinder 5 is surrounded by the reservoir 6,

formed upon platen 17 andfadapted to contain the liquid used to charge v'cylinder 5. A duct 7 connects the reservoir 6 with the interior of the cylinder 5. This duct is controlled by a valve 8, by which the communication between the reservoir and the'cylinder may be temporarily interrupted. The rod 9 of valve 8 is provided at its upper end with a head 10,

supported by a sleeve 11, which is screwed into the pressure-spindle 12 and is packed, as at 22.

The pressure-spindle 12 has a bore or socket 13, adapted to accommodate the head during the descent and ascent of the spindle. The spindle is threaded, `as shown, and is tapped into a nut 14, secured to frame 2. A handlwheel 16 permits the spindle to berotated, so

that it rises or falls within the bore of piston 4. This bore constitutes the reduced section of the compression-chamber formed within cylinder 5 and is in communication with such cylinder.

The drawing illustrates the invention apseriai No. 203,845. (No model.) l

'spindle 12 a rack may be employed and the.

reciprocating movement of the spindle may be effected by a crank, a steam-piston, compressed air, electricity, &c.

Normally the platen 17 with its reservoir 6 and hydraulic cylinder 5, is supported upon the top of spindle 12 by means of a cross-head .19, which rests upon the spindle and is connected to the platen by rods 18. If during operation the spindle is lowered, the platen will follow by gravity while the machine runs light-a'. e., until the die 20 strikes the workpiece 21-the cross-head 19 remaining seated upon the spindle. During this movement the valve 8, suspended by its head 10 from collar 11, will remain open, as shown, so that water may enter from reservoir 6 into cylinder 5 and charge the latter.

When the die 2O strikes the work-piece 21, the platen 17 can no longer follow the descent of spindle 12, and the latter will therefore move downward alone. v By this movement the collar11 will descend beneath the head 10, so as to liberate the same and cause the valve 8 to close by gravity. The water contained in the hydraulic cylinder 5 will thus serve as a transmission medium for conveying the pressure of the spindle to the base of the cylinder. Thus the platen 17 will be forced against the work-piece with a pressure the force of which depends upon the ratio between the cross-section of spindle 12 and that of piston 11. Upon the upward movement the spindle 12 first rises alone until its upper end strikes the cross-,head 19. the cross-head thus becomes engaged the valve 8 is opened by the elevation of head 10 through collar 11.

Shortly before After the'spindle has contactedI at the side of the cylinder, so that it does not surround the same. The reservoir may be cast integral with the platen 17, so that platen, cylinder, and reservoir are made in one piece, or either of these parts may be made separate. In the latter ease all parts are rigidly connected, so that they move in unison. By uniting the cylinder 5 and the reservoir 6 with the platen 17 the latter is loaded to advantage- Without increasing the Weight of the press. The platen during the light running of the machine will, owing to its load, follow the descending spindle more readily, which insures a quicker and more positive working of the press.

W h at I claim is- 1. In a hydraulic press, an upper platen provided with a cylinder and a reservoir,

OTT() PII `IL'I Pl).

Witnesses RUDOLPH Finolm, P. IV. DUNN. 

